--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/com/sun/tools/hat/internal/model/JavaLazyReadObject.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,187 @@
+/*
+ * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/*
+ * The contents of this file are subject to the Sun Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License. A copy of the License is available at
+ * http://www.sun.com/, and in the file LICENSE.html in the
+ * doc directory.
+ *
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun. Portions created by Bill Foote and others
+ * at Javasoft/Sun are Copyright (C) 1997-2004. All Rights Reserved.
+ *
+ * In addition to the formal license, I ask that you don't
+ * change the history or donations files without permission.
+ *
+ */
+
+package com.sun.tools.hat.internal.model;
+
+import java.io.IOException;
+import com.sun.tools.hat.internal.parser.ReadBuffer;
+
+/*
+ * Base class for lazily read Java heap objects.
+ */
+public abstract class JavaLazyReadObject extends JavaHeapObject {
+
+ // file offset from which this object data starts
+ private final long offset;
+
+ protected JavaLazyReadObject(long offset) {
+ this.offset = offset;
+ }
+
+ public final int getSize() {
+ return getValueLength() + getClazz().getMinimumObjectSize();
+ }
+
+ protected final long getOffset() {
+ return offset;
+ }
+
+ // return the length of the data for this object
+ protected final int getValueLength() {
+ try {
+ return readValueLength();
+ } catch (IOException exp) {
+ System.err.println("lazy read failed at offset " + offset);
+ exp.printStackTrace();
+ return 0;
+ }
+ }
+
+ // get this object's content as byte array
+ protected final byte[] getValue() {
+ try {
+ return readValue();
+ } catch (IOException exp) {
+ System.err.println("lazy read failed at offset " + offset);
+ exp.printStackTrace();
+ return Snapshot.EMPTY_BYTE_ARRAY;
+ }
+ }
+
+ // get ID of this object
+ public final long getId() {
+ try {
+ ReadBuffer buf = getClazz().getReadBuffer();
+ int idSize = getClazz().getIdentifierSize();
+ if (idSize == 4) {
+ return ((long)buf.getInt(offset)) & Snapshot.SMALL_ID_MASK;
+ } else {
+ return buf.getLong(offset);
+ }
+ } catch (IOException exp) {
+ System.err.println("lazy read failed at offset " + offset);
+ exp.printStackTrace();
+ return -1;
+ }
+ }
+
+ protected abstract int readValueLength() throws IOException;
+ protected abstract byte[] readValue() throws IOException;
+
+ // make Integer or Long for given object ID
+ protected static Number makeId(long id) {
+ if ((id & ~Snapshot.SMALL_ID_MASK) == 0) {
+ return new Integer((int)id);
+ } else {
+ return new Long(id);
+ }
+ }
+
+ // get ID as long value from Number
+ protected static long getIdValue(Number num) {
+ long id = num.longValue();
+ if (num instanceof Integer) {
+ id &= Snapshot.SMALL_ID_MASK;
+ }
+ return id;
+ }
+
+ // read object ID from given index from given byte array
+ protected final long objectIdAt(int index, byte[] data) {
+ int idSize = getClazz().getIdentifierSize();
+ if (idSize == 4) {
+ return ((long)intAt(index, data)) & Snapshot.SMALL_ID_MASK;
+ } else {
+ return longAt(index, data);
+ }
+ }
+
+ // utility methods to read primitive types from byte array
+ protected static byte byteAt(int index, byte[] value) {
+ return value[index];
+ }
+
+ protected static boolean booleanAt(int index, byte[] value) {
+ return (value[index] & 0xff) == 0? false: true;
+ }
+
+ protected static char charAt(int index, byte[] value) {
+ int b1 = ((int) value[index++] & 0xff);
+ int b2 = ((int) value[index++] & 0xff);
+ return (char) ((b1 << 8) + b2);
+ }
+
+ protected static short shortAt(int index, byte[] value) {
+ int b1 = ((int) value[index++] & 0xff);
+ int b2 = ((int) value[index++] & 0xff);
+ return (short) ((b1 << 8) + b2);
+ }
+
+ protected static int intAt(int index, byte[] value) {
+ int b1 = ((int) value[index++] & 0xff);
+ int b2 = ((int) value[index++] & 0xff);
+ int b3 = ((int) value[index++] & 0xff);
+ int b4 = ((int) value[index++] & 0xff);
+ return ((b1 << 24) + (b2 << 16) + (b3 << 8) + b4);
+ }
+
+ protected static long longAt(int index, byte[] value) {
+ long val = 0;
+ for (int j = 0; j < 8; j++) {
+ val = val << 8;
+ int b = ((int)value[index++]) & 0xff;
+ val |= b;
+ }
+ return val;
+ }
+
+ protected static float floatAt(int index, byte[] value) {
+ int val = intAt(index, value);
+ return Float.intBitsToFloat(val);
+ }
+
+ protected static double doubleAt(int index, byte[] value) {
+ long val = longAt(index, value);
+ return Double.longBitsToDouble(val);
+ }
+}